.TH "QwtPlotIntervalCurve" 3 "Mon Jun 1 2020" "Version 6.1.5" "Qwt User's Guide" \" -*- nroff -*-
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.SH NAME
QwtPlotIntervalCurve \- \fBQwtPlotIntervalCurve\fP represents a series of samples, where each value is associated with an interval ( $[y1,y2] = f(x)$ )\&.  

.SH SYNOPSIS
.br
.PP
.PP
\fC#include <qwt_plot_intervalcurve\&.h>\fP
.PP
Inherits \fBQwtPlotSeriesItem\fP, and \fBQwtSeriesStore< QwtIntervalSample >\fP\&.
.SS "Public Types"

.in +1c
.ti -1c
.RI "enum \fBCurveStyle\fP { \fBNoCurve\fP, \fBTube\fP, \fBUserCurve\fP = 100 }"
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.RI "Curve styles\&. The default setting is \fBQwtPlotIntervalCurve::Tube\fP\&. "
.ti -1c
.RI "enum \fBPaintAttribute\fP { \fBClipPolygons\fP = 0x01, \fBClipSymbol\fP = 0x02 }"
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.ti -1c
.RI "typedef QFlags< \fBPaintAttribute\fP > \fBPaintAttributes\fP"
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.RI "Paint attributes\&. "
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.SS "Public Member Functions"

.in +1c
.ti -1c
.RI "\fBQwtPlotIntervalCurve\fP (const QString &\fBtitle\fP=QString())"
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.RI "\fBQwtPlotIntervalCurve\fP (const \fBQwtText\fP &\fBtitle\fP)"
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.ti -1c
.RI "virtual \fB~QwtPlotIntervalCurve\fP ()"
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.RI "Destructor\&. "
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.RI "virtual int \fBrtti\fP () const"
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.ti -1c
.RI "void \fBsetPaintAttribute\fP (\fBPaintAttribute\fP, bool on=true)"
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.ti -1c
.RI "bool \fBtestPaintAttribute\fP (\fBPaintAttribute\fP) const"
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.ti -1c
.RI "void \fBsetSamples\fP (const QVector< \fBQwtIntervalSample\fP > &)"
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.ti -1c
.RI "void \fBsetSamples\fP (\fBQwtSeriesData\fP< \fBQwtIntervalSample\fP > *)"
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.ti -1c
.RI "void \fBsetPen\fP (const QColor &, qreal width=0\&.0, Qt::PenStyle=Qt::SolidLine)"
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.ti -1c
.RI "void \fBsetPen\fP (const QPen &)"
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.RI "Assign a pen\&. "
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.RI "const QPen & \fBpen\fP () const"
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.ti -1c
.RI "void \fBsetBrush\fP (const QBrush &)"
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.ti -1c
.RI "const QBrush & \fBbrush\fP () const"
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.ti -1c
.RI "void \fBsetStyle\fP (\fBCurveStyle\fP \fBstyle\fP)"
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.ti -1c
.RI "\fBCurveStyle\fP \fBstyle\fP () const"
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.ti -1c
.RI "void \fBsetSymbol\fP (const \fBQwtIntervalSymbol\fP *)"
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.ti -1c
.RI "const \fBQwtIntervalSymbol\fP * \fBsymbol\fP () const"
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.RI "virtual void \fBdrawSeries\fP (QPainter *, const \fBQwtScaleMap\fP &xMap, const \fBQwtScaleMap\fP &yMap, const QRectF &canvasRect, int from, int to) const"
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.ti -1c
.RI "virtual QRectF \fBboundingRect\fP () const"
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.RI "virtual \fBQwtGraphic\fP \fBlegendIcon\fP (int index, const QSizeF &) const"
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.SS "Protected Member Functions"

.in +1c
.ti -1c
.RI "void \fBinit\fP ()"
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.RI "Initialize internal members\&. "
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.RI "virtual void \fBdrawTube\fP (QPainter *, const \fBQwtScaleMap\fP &xMap, const \fBQwtScaleMap\fP &yMap, const QRectF &canvasRect, int from, int to) const"
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.ti -1c
.RI "virtual void \fBdrawSymbols\fP (QPainter *, const \fBQwtIntervalSymbol\fP &, const \fBQwtScaleMap\fP &xMap, const \fBQwtScaleMap\fP &yMap, const QRectF &canvasRect, int from, int to) const"
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.in -1c
.SH "Detailed Description"
.PP 
\fBQwtPlotIntervalCurve\fP represents a series of samples, where each value is associated with an interval ( $[y1,y2] = f(x)$ )\&. 

The representation depends on the \fBstyle()\fP and an optional \fBsymbol()\fP that is displayed for each interval\&. \fBQwtPlotIntervalCurve\fP might be used to display error bars or the area between 2 curves\&. 
.SH "Member Enumeration Documentation"
.PP 
.SS "enum \fBQwtPlotIntervalCurve::CurveStyle\fP"

.PP
Curve styles\&. The default setting is \fBQwtPlotIntervalCurve::Tube\fP\&. 
.PP
\fBSee also\fP
.RS 4
\fBsetStyle()\fP, \fBstyle()\fP 
.RE
.PP

.PP
\fBEnumerator\fP
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.TP
\fB\fINoCurve \fP\fP
Don't draw a curve\&. Note: This doesn't affect the symbols\&. 
.TP
\fB\fITube \fP\fP
Build 2 curves from the upper and lower limits of the intervals and draw them with the \fBpen()\fP\&. The area between the curves is filled with the \fBbrush()\fP\&. 
.TP
\fB\fIUserCurve \fP\fP
Styles >= \fBQwtPlotIntervalCurve::UserCurve\fP are reserved for derived classes that overload \fBdrawSeries()\fP with additional application specific curve types\&. 
.SS "enum \fBQwtPlotIntervalCurve::PaintAttribute\fP"
Attributes to modify the drawing algorithm\&. 
.PP
\fBSee also\fP
.RS 4
\fBsetPaintAttribute()\fP, \fBtestPaintAttribute()\fP 
.RE
.PP

.PP
\fBEnumerator\fP
.in +1c
.TP
\fB\fIClipPolygons \fP\fP
Clip polygons before painting them\&. In situations, where points are far outside the visible area (f\&.e when zooming deep) this might be a substantial improvement for the painting performance\&. 
.TP
\fB\fIClipSymbol \fP\fP
Check if a symbol is on the plot canvas before painting it\&. 
.SH "Constructor & Destructor Documentation"
.PP 
.SS "QwtPlotIntervalCurve::QwtPlotIntervalCurve (const QString & title = \fCQString()\fP)\fC [explicit]\fP"
Constructor 
.PP
\fBParameters\fP
.RS 4
\fItitle\fP Title of the curve 
.RE
.PP

.SS "QwtPlotIntervalCurve::QwtPlotIntervalCurve (const \fBQwtText\fP & title)\fC [explicit]\fP"
Constructor 
.PP
\fBParameters\fP
.RS 4
\fItitle\fP Title of the curve 
.RE
.PP

.SH "Member Function Documentation"
.PP 
.SS "QRectF QwtPlotIntervalCurve::boundingRect () const\fC [virtual]\fP"

.PP
\fBReturns\fP
.RS 4
Bounding rectangle of all samples\&. For an empty series the rectangle is invalid\&. 
.RE
.PP

.PP
Reimplemented from \fBQwtPlotSeriesItem\fP\&.
.SS "const QBrush & QwtPlotIntervalCurve::brush () const"

.PP
\fBReturns\fP
.RS 4
Brush used to fill the area in Tube \fBstyle()\fP 
.RE
.PP
\fBSee also\fP
.RS 4
\fBsetBrush()\fP, \fBsetStyle()\fP, \fBCurveStyle\fP 
.RE
.PP

.SS "void QwtPlotIntervalCurve::drawSeries (QPainter * painter, const \fBQwtScaleMap\fP & xMap, const \fBQwtScaleMap\fP & yMap, const QRectF & canvasRect, int from, int to) const\fC [virtual]\fP"
Draw a subset of the samples
.PP
\fBParameters\fP
.RS 4
\fIpainter\fP Painter 
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\fIxMap\fP Maps x-values into pixel coordinates\&. 
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\fIyMap\fP Maps y-values into pixel coordinates\&. 
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\fIcanvasRect\fP Contents rectangle of the canvas 
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\fIfrom\fP Index of the first sample to be painted 
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\fIto\fP Index of the last sample to be painted\&. If to < 0 the series will be painted to its last sample\&.
.RE
.PP
\fBSee also\fP
.RS 4
\fBdrawTube()\fP, \fBdrawSymbols()\fP 
.RE
.PP

.PP
Implements \fBQwtPlotSeriesItem\fP\&.
.SS "void QwtPlotIntervalCurve::drawSymbols (QPainter * painter, const \fBQwtIntervalSymbol\fP & symbol, const \fBQwtScaleMap\fP & xMap, const \fBQwtScaleMap\fP & yMap, const QRectF & canvasRect, int from, int to) const\fC [protected]\fP, \fC [virtual]\fP"
Draw symbols for a subset of the samples
.PP
\fBParameters\fP
.RS 4
\fIpainter\fP Painter 
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\fIsymbol\fP Interval symbol 
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\fIxMap\fP x map 
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\fIyMap\fP y map 
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\fIcanvasRect\fP Contents rectangle of the canvas 
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\fIfrom\fP Index of the first sample to be painted 
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\fIto\fP Index of the last sample to be painted
.RE
.PP
\fBSee also\fP
.RS 4
\fBsetSymbol()\fP, \fBdrawSeries()\fP, \fBdrawTube()\fP 
.RE
.PP

.SS "void QwtPlotIntervalCurve::drawTube (QPainter * painter, const \fBQwtScaleMap\fP & xMap, const \fBQwtScaleMap\fP & yMap, const QRectF & canvasRect, int from, int to) const\fC [protected]\fP, \fC [virtual]\fP"
Draw a tube
.PP
Builds 2 curves from the upper and lower limits of the intervals and draws them with the \fBpen()\fP\&. The area between the curves is filled with the \fBbrush()\fP\&.
.PP
\fBParameters\fP
.RS 4
\fIpainter\fP Painter 
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\fIxMap\fP Maps x-values into pixel coordinates\&. 
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\fIyMap\fP Maps y-values into pixel coordinates\&. 
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\fIcanvasRect\fP Contents rectangle of the canvas 
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\fIfrom\fP Index of the first sample to be painted 
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\fIto\fP Index of the last sample to be painted\&. If to < 0 the series will be painted to its last sample\&.
.RE
.PP
\fBSee also\fP
.RS 4
\fBdrawSeries()\fP, \fBdrawSymbols()\fP 
.RE
.PP

.SS "\fBQwtGraphic\fP QwtPlotIntervalCurve::legendIcon (int index, const QSizeF & size) const\fC [virtual]\fP"

.PP
\fBReturns\fP
.RS 4
Icon for the legend
.RE
.PP
In case of Tube \fBstyle()\fP the icon is a plain rectangle filled with the \fBbrush()\fP\&. If a symbol is assigned it is scaled to size\&.
.PP
\fBParameters\fP
.RS 4
\fIindex\fP Index of the legend entry ( ignored as there is only one ) 
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\fIsize\fP Icon size
.RE
.PP
\fBSee also\fP
.RS 4
\fBQwtPlotItem::setLegendIconSize()\fP, \fBQwtPlotItem::legendData()\fP 
.RE
.PP

.PP
Reimplemented from \fBQwtPlotItem\fP\&.
.SS "const QPen & QwtPlotIntervalCurve::pen () const"

.PP
\fBReturns\fP
.RS 4
Pen used to draw the lines 
.RE
.PP
\fBSee also\fP
.RS 4
\fBsetPen()\fP, \fBbrush()\fP 
.RE
.PP

.SS "int QwtPlotIntervalCurve::rtti () const\fC [virtual]\fP"

.PP
\fBReturns\fP
.RS 4
\fBQwtPlotItem::Rtti_PlotIntervalCurve\fP 
.RE
.PP

.PP
Reimplemented from \fBQwtPlotItem\fP\&.
.SS "void QwtPlotIntervalCurve::setBrush (const QBrush & brush)"
Assign a brush\&.
.PP
The brush is used to fill the area in Tube \fBstyle()\fP\&.
.PP
\fBParameters\fP
.RS 4
\fIbrush\fP Brush 
.RE
.PP
\fBSee also\fP
.RS 4
\fBbrush()\fP, \fBpen()\fP, \fBsetStyle()\fP, \fBCurveStyle\fP 
.RE
.PP

.SS "void QwtPlotIntervalCurve::setPaintAttribute (\fBPaintAttribute\fP attribute, bool on = \fCtrue\fP)"
Specify an attribute how to draw the curve
.PP
\fBParameters\fP
.RS 4
\fIattribute\fP Paint attribute 
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\fIon\fP On/Off 
.RE
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\fBSee also\fP
.RS 4
\fBtestPaintAttribute()\fP 
.RE
.PP

.SS "void QwtPlotIntervalCurve::setPen (const QColor & color, qreal width = \fC0\&.0\fP, Qt::PenStyle style = \fCQt::SolidLine\fP)"
Build and assign a pen
.PP
In Qt5 the default pen width is 1\&.0 ( 0\&.0 in Qt4 ) what makes it non cosmetic ( see QPen::isCosmetic() )\&. This method has been introduced to hide this incompatibility\&.
.PP
\fBParameters\fP
.RS 4
\fIcolor\fP Pen color 
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\fIwidth\fP Pen width 
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\fIstyle\fP Pen style
.RE
.PP
\fBSee also\fP
.RS 4
\fBpen()\fP, \fBbrush()\fP 
.RE
.PP

.SS "void QwtPlotIntervalCurve::setPen (const QPen & pen)"

.PP
Assign a pen\&. 
.PP
\fBParameters\fP
.RS 4
\fIpen\fP New pen 
.RE
.PP
\fBSee also\fP
.RS 4
\fBpen()\fP, \fBbrush()\fP 
.RE
.PP

.SS "void QwtPlotIntervalCurve::setSamples (const QVector< \fBQwtIntervalSample\fP > & samples)"
Initialize data with an array of samples\&. 
.PP
\fBParameters\fP
.RS 4
\fIsamples\fP Vector of samples 
.RE
.PP

.SS "void QwtPlotIntervalCurve::setSamples (\fBQwtSeriesData\fP< \fBQwtIntervalSample\fP > * data)"
Assign a series of samples
.PP
\fBsetSamples()\fP is just a wrapper for \fBsetData()\fP without any additional value - beside that it is easier to find for the developer\&.
.PP
\fBParameters\fP
.RS 4
\fIdata\fP Data 
.RE
.PP
\fBWarning\fP
.RS 4
The item takes ownership of the data object, deleting it when its not used anymore\&. 
.RE
.PP

.SS "void QwtPlotIntervalCurve::setStyle (\fBCurveStyle\fP style)"
Set the curve's drawing style
.PP
\fBParameters\fP
.RS 4
\fIstyle\fP Curve style 
.RE
.PP
\fBSee also\fP
.RS 4
\fBCurveStyle\fP, \fBstyle()\fP 
.RE
.PP

.SS "void QwtPlotIntervalCurve::setSymbol (const \fBQwtIntervalSymbol\fP * symbol)"
Assign a symbol\&.
.PP
\fBParameters\fP
.RS 4
\fIsymbol\fP Symbol 
.RE
.PP
\fBSee also\fP
.RS 4
\fBsymbol()\fP 
.RE
.PP

.SS "\fBQwtPlotIntervalCurve::CurveStyle\fP QwtPlotIntervalCurve::style () const"

.PP
\fBReturns\fP
.RS 4
Style of the curve 
.RE
.PP
\fBSee also\fP
.RS 4
\fBsetStyle()\fP 
.RE
.PP

.SS "const \fBQwtIntervalSymbol\fP * QwtPlotIntervalCurve::symbol () const"

.PP
\fBReturns\fP
.RS 4
Current symbol or NULL, when no symbol has been assigned 
.RE
.PP
\fBSee also\fP
.RS 4
\fBsetSymbol()\fP 
.RE
.PP

.SS "bool QwtPlotIntervalCurve::testPaintAttribute (\fBPaintAttribute\fP attribute) const"

.PP
\fBReturns\fP
.RS 4
True, when attribute is enabled 
.RE
.PP
\fBSee also\fP
.RS 4
\fBPaintAttribute\fP, \fBsetPaintAttribute()\fP 
.RE
.PP


.SH "Author"
.PP 
Generated automatically by Doxygen for Qwt User's Guide from the source code\&.
